243222541 has 2 divisors, whose sum is σ = 243222542. Its totient is φ = 243222540.

The previous prime is 243222527. The next prime is 243222547. The reversal of 243222541 is 145222342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239785225 + 3437316 = 15485^2 + 1854^2 .

It is a cyclic number.

It is not a de Polignac number, because 243222541 - 2¹⁵ = 243189773 is a prime.

It is a pancake number, because a pancake can be divided into 243222541 parts by 22055 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243222547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121611270 + 121611271.

It is an arithmetic number, because the mean of its divisors is an integer number (121611271).

Almost surely, 2^243222541 is an apocalyptic number.

It is an amenable number.

243222541 is a deficient number, since it is larger than the sum of its proper divisors (1).

243222541 is an equidigital number, since it uses as much as digits as its factorization.

243222541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 25.

The square root of 243222541 is about 15595.5936405127. The cubic root of 243222541 is about 624.2155842389.

Adding to 243222541 its reverse (145222342), we get a palindrome (388444883).

It can be divided in two parts, 243 and 222541, that added together give a square (222784 = 472²).

The spelling of 243222541 in words is "two hundred forty-three million, two hundred twenty-two thousand, five hundred forty-one".